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Xiang Li,Zhaoling Li,Xiaonan Dang,Dan Luan,Feng Wang 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
In this work, plasticized spinning PAN fibers were treated at low carbonization temperature for the first time. The properties of treated fibers were characterized by elemental analysis (EA), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) respectively. The SEM results show that cross section of the pre-carbonized fibers is circular with no apparent skin-core structure. During the pre-carbonization process (320-380 oC), fracture mode of the fibers gradually changes from ductile to brittle and fibril diameter gradually decreases. Pre-carbonization temperature at 350 oC significantly accelerates chemical reactions. The FTIR results show that a stable oxygen structure is generated as treated at 320 oC.
Principle Issues and Future Prospect on Sliding Arc Ablation of Metal Rail
Cong Haoxi,Zhou Yang,Zhaori Getu,Wang Yuxuan,Wei Haobo,Liu Zhaoling,Wang Jian,Zhang Li,Liu Hongshun,Li Qingmin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
Arc ablation occurs when the armature passes over the surface of metal rail. Ablation not only seriously afects the service life, but also may cause the failure to launch. In this paper, the research status of sliding arc ablation technology is summarized from the mechanism of sliding arc ablation, the characterization method of sliding arc ablation degree, and the enhanced design of materials or structures. Three key issues that need to be further solved are listed: the infuence mechanism of sliding arc ablation on microstructure and properties of metal materials, the service properties evaluation and quantitative characterization methods of metal material, as well as the modifed and enhanced design of materials or structures. In response to those problems, eforts are needed to improve the awareness of sliding arc ablation with the theoretical basis and characterization methods, as well as guide the improvement and strengthening of rail design.